test/Analysis/ScalarEvolution/ranges.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
 ; RUN: opt < %s -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s
 ; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"

; Collection of cases exercising range logic, mostly (but not exclusively)
; involving SCEVUnknowns.

declare void @llvm.assume(i1)

define i32 @ashr(i32 %a) {
; CHECK-LABEL: 'ashr'
; CHECK-NEXT:  Classifying expressions for: @ashr
; CHECK-NEXT:    %ashr = ashr i32 %a, 31
; CHECK-NEXT:    --> %ashr U: [0,1) S: [0,1)
; CHECK-NEXT:  Determining loop execution counts for: @ashr
;
  %ashr = ashr i32 %a, 31
  %pos = icmp sge i32 %a, 0
  call void @llvm.assume(i1 %pos)
  ret i32 %ashr
}

; Highlight the fact that non-argument non-instructions are
; also possible.
@G = external global i8
define i64 @ashr_global() {
; CHECK-LABEL: 'ashr_global'
; CHECK-NEXT:  Classifying expressions for: @ashr_global
; CHECK-NEXT:    %ashr = ashr i64 ptrtoint (i8* @G to i64), 63
; CHECK-NEXT:    --> %ashr U: [-1,1) S: [-1,1)
; CHECK-NEXT:  Determining loop execution counts for: @ashr_global
;
  %ashr = ashr i64 ptrtoint (i8* @G to i64), 63
  %pos = icmp sge i8* @G, null
  call void @llvm.assume(i1 %pos)
  ret i64 %ashr
}


define i32 @shl(i32 %a) {
; CHECK-LABEL: 'shl'
; CHECK-NEXT:  Classifying expressions for: @shl
; CHECK-NEXT:    %res = shl i32 %a, 2
; CHECK-NEXT:    --> (4 * %a) U: [0,-3) S: [-2147483648,2147483645)
; CHECK-NEXT:  Determining loop execution counts for: @shl
;
  %res = shl i32 %a, 2
  %pos = icmp ult i32 %a, 1024
  call void @llvm.assume(i1 %pos)
  ret i32 %res
}

define i32 @lshr(i32 %a) {
; CHECK-LABEL: 'lshr'
; CHECK-NEXT:  Classifying expressions for: @lshr
; CHECK-NEXT:    %res = lshr i32 %a, 31
; CHECK-NEXT:    --> (%a /u -2147483648) U: [0,2) S: [0,2)
; CHECK-NEXT:  Determining loop execution counts for: @lshr
;
  %res = lshr i32 %a, 31
  %pos = icmp sge i32 %a, 0
  call void @llvm.assume(i1 %pos)
  ret i32 %res
}


define i32 @udiv(i32 %a) {
; CHECK-LABEL: 'udiv'
; CHECK-NEXT:  Classifying expressions for: @udiv
; CHECK-NEXT:    %res = udiv i32 %a, -2147483648
; CHECK-NEXT:    --> (%a /u -2147483648) U: [0,2) S: [0,2)
; CHECK-NEXT:  Determining loop execution counts for: @udiv
;
  %res = udiv i32 %a, 2147483648
  %pos = icmp sge i32 %a, 0
  call void @llvm.assume(i1 %pos)
  ret i32 %res
}

define i64 @sext(i8 %a) {
; CHECK-LABEL: 'sext'
; CHECK-NEXT:  Classifying expressions for: @sext
; CHECK-NEXT:    %res = sext i8 %a to i64
; CHECK-NEXT:    --> (sext i8 %a to i64) U: [-128,128) S: [-128,128)
; CHECK-NEXT:  Determining loop execution counts for: @sext
;
  %res = sext i8 %a to i64
  %pos = icmp sge i8 %a, 0
  call void @llvm.assume(i1 %pos)
  ret i64 %res
}

define i64 @zext(i8 %a) {
; CHECK-LABEL: 'zext'
; CHECK-NEXT:  Classifying expressions for: @zext
; CHECK-NEXT:    %res = zext i8 %a to i64
; CHECK-NEXT:    --> (zext i8 %a to i64) U: [0,256) S: [0,256)
; CHECK-NEXT:  Determining loop execution counts for: @zext
;
  %res = zext i8 %a to i64
  %pos = icmp sge i8 %a, 0
  call void @llvm.assume(i1 %pos)
  ret i64 %res
}